EZ-F knock retard!
05-26-2008, 04:37 PM
#32
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I've gotten comfortable using the system, so I've started using Regular (Chevron 87 octane) gas! I had to really try to get it to knock, even on a recent 95°F day, with the A/C on. I purposely floored it on a steep hill - heard one knock, the light came on and there were no more knocks, all without letting off the pedal.
Note that I also have: "cold plugs, WR5DC, a cold thermostat, 75°C, radiator covers, and the rear hood seal removed".
The whole schmeel, S4 knock sensor/KnockLite/delay circuit, cost >$200, so with a ~$0.20 savings per gallon, and ~17mpg, it will pay for itself in just 17,000 miles.
Note that I also have: "cold plugs, WR5DC, a cold thermostat, 75°C, radiator covers, and the rear hood seal removed".
The whole schmeel, S4 knock sensor/KnockLite/delay circuit, cost >$200, so with a ~$0.20 savings per gallon, and ~17mpg, it will pay for itself in just 17,000 miles.
06-10-2008, 05:13 PM
#33
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Att: PorKen
This is intresting. I´d really like to get more power from my -86 32v and I´m amazed of what you achieved.
I laborated with some E85 (85% Ethanol/15% gasoline sold in Sweden, 104 octane) mixing that with fuel in my daily driver which is a Renault Megane minivan. The currant mixture I use is 20% 95 octane gasoline and 80% of E85. The car seems to have more power and actually it is more fuelefficent when using this mixture instead of regular 95 octane gasoline.
My question to you is as follows: If I go with the same mixture in the 928, would I need a knock-sensor? What about that octaneloop?
How did you advance the ignition timing?
Remember, my engine has a 9,3:1 compression ratio, I think. It´s 288hp anyway.
Best regards/
Tobias
This is intresting. I´d really like to get more power from my -86 32v and I´m amazed of what you achieved.
I laborated with some E85 (85% Ethanol/15% gasoline sold in Sweden, 104 octane) mixing that with fuel in my daily driver which is a Renault Megane minivan. The currant mixture I use is 20% 95 octane gasoline and 80% of E85. The car seems to have more power and actually it is more fuelefficent when using this mixture instead of regular 95 octane gasoline.
My question to you is as follows: If I go with the same mixture in the 928, would I need a knock-sensor? What about that octaneloop?
How did you advance the ignition timing?
Remember, my engine has a 9,3:1 compression ratio, I think. It´s 288hp anyway.
Best regards/
Tobias
06-10-2008, 05:41 PM
#34
It is amazing what Ken has done..to take the lowly early 32 valve motor and update it so it now puts out near what the superior S4 motor puts out. Imagine if Ken gets a true 32 valve (87 and up) motor...the increases would be near limitless hahahahaha.....
hahahahaha.....
01-12-2011, 10:35 PM
#36
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Matt - that kinda worked, but it was very basic and stayed on too long even with a light knock, so I removed it. It was for use with stock chips, modified externally for extra advance, anyway.
My own chips have with new programming for air temp x load compensation (coolant temp now too) to keep the advance as high as possible, without audible or inaudible knocking, and no perceptible steps. For example, if you floor it after a long stoplight in hot weather, it may feel a little dull, but after a few hundred feet, as the airbox cools, you'll feel the power creep back up.
Just like a wideband 02 sensor, having a knock light is nice to have when you are tuning, but I unplug it once I've finished.
My own chips have with new programming for air temp x load compensation (coolant temp now too) to keep the advance as high as possible, without audible or inaudible knocking, and no perceptible steps. For example, if you floor it after a long stoplight in hot weather, it may feel a little dull, but after a few hundred feet, as the airbox cools, you'll feel the power creep back up.
Just like a wideband 02 sensor, having a knock light is nice to have when you are tuning, but I unplug it once I've finished.
